Justin Molush
February 11th, 2012, 10:17 PM
For 4K, as I understand it, the new JVC camera records each 108060p quadrant at 36Mbps, not 28Mbps. That is, by arithmetic, almost a 30% higher bitrate than the highest HD standard. Since there are four quadrants, the effective bitrate for the 4K picture is 4*36 =144Mbps.
This is what I was expecting, separate encodes for each of the four quadrants, resulting in a higher bitrate and little encoding artifacts. Now, what I am curious about, is what is it encoding 4k in? Is it an AVCHD variant in each of the four quadrants? (I thought AVCHD topped out at 28MBps...?)... Plus, if it encodes at such bitrate, why can't it do 4:2:2 at 1080p? That sort of sampling and bitrate seems trivial compared to providing a quad channel 4K output... correct me if I am wrong since I have been out of the engineering field for over 5 years now and a lot of things change quickly.
In addition, what are our options to create singular files? Its not like we can simply go into FCP and log and transfer 4K... Im sure the only way is the proprietary software the camera comes with to output into some 4:2:0 4K raster which isn't inherently bad because this seems like a compact, new age, UHD ENG camera. White balance and you should be good to go!
Im curious to see how this cam is applied professionally - I know I won't use it for my projects since 1080p is on the outer limits already of what is needed...
This is what I was expecting, separate encodes for each of the four quadrants, resulting in a higher bitrate and little encoding artifacts. Now, what I am curious about, is what is it encoding 4k in? Is it an AVCHD variant in each of the four quadrants? (I thought AVCHD topped out at 28MBps...?)... Plus, if it encodes at such bitrate, why can't it do 4:2:2 at 1080p? That sort of sampling and bitrate seems trivial compared to providing a quad channel 4K output... correct me if I am wrong since I have been out of the engineering field for over 5 years now and a lot of things change quickly.
In addition, what are our options to create singular files? Its not like we can simply go into FCP and log and transfer 4K... Im sure the only way is the proprietary software the camera comes with to output into some 4:2:0 4K raster which isn't inherently bad because this seems like a compact, new age, UHD ENG camera. White balance and you should be good to go!
Im curious to see how this cam is applied professionally - I know I won't use it for my projects since 1080p is on the outer limits already of what is needed...